2020-11-02 17:17:01 -05:00
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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2020-11-04 08:02:01 -05:00
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.\" * are also available at https://curl.se/docs/copyright.html.
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2020-11-02 17:17:01 -05:00
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_HSTSWRITEFUNCTION 3 "14 Sep 2020" "libcurl 7.74.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_HSTSWRITEFUNCTION \- write callback for HSTS hosts
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLSTScode hstswrite(CURL *easy, struct curl_hstsentry *sts,
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struct curl_index *count, void *userp);
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTSWRITEFUNCTION, hstswrite);
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.SH EXPERIMENTAL
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Warning: this feature is early code and is marked as experimental. It can only
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be enabled by explicitly telling configure with \fB--enable-hsts\fP. You are
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advised to not ship this in production before the experimental label is
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removed.
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.SH DESCRIPTION
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Pass a pointer to your callback function, as the prototype shows above.
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This callback function gets called by libcurl repeatedly to allow the
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application to store the in-memory HSTS cache when libcurl is about to discard
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it.
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Set the \fIuserp\fP argument with the \fICURLOPT_HSTSWRITEDATA(3)\fP option or
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it will be NULL.
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When the callback is invoked, the \fIsts\fP pointer points to a populated
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struct: Read the host name to 'name' (it is 'namelen' bytes long and null
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terminated. The 'includeSubDomains' field is non-zero if the entry matches
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subdomains. The 'expire' string is a date stamp null-terminated string using
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the syntax YYYYMMDD HH:MM:SS.
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The callback should return \fICURLSTS_OK\fP if it succeeded and is prepared to
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be called again (for another host) or \fICURLSTS_DONE\fP if there's nothing
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more to do. It can also return \fICURLSTS_FAIL\fP to signal error.
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.SH DEFAULT
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NULL - no callback.
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.SH PROTOCOLS
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This feature is only used for HTTP(S) transfer.
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.SH EXAMPLE
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.nf
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{
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/* set HSTS read callback */
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curl_easy_setopt(curl, CURLOPT_HSTSWRITEFUNCTION, hstswrite);
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/* pass in suitable argument to the callback */
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curl_easy_setopt(curl, CURLOPT_HSTSWRITEDATA, &hstspreload[0]);
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result = curl_easy_perform(curl);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.74.0
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.SH RETURN VALUE
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This will return CURLE_OK.
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.SH "SEE ALSO"
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.BR CURLOPT_HSTSWRITEDATA "(3), " CURLOPT_HSTSWRITEFUNCTION "(3), "
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.BR CURLOPT_HSTS "(3), " CURLOPT_HSTS_CTRL "(3), "
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